CN101779400A - Reference signal generation in a wireless communication system - Google Patents
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Abstract
Techniques for generating reference signals in a wireless communication system are described. A set of Q reference signal sequences may be generated based on G pseudo-random sequences and L scrambling sequences, where, and. The Q reference signal sequences may be used for Q cell identities (IDs), one reference signal sequence for each cell ID. In one design, a Node B may determine first and second indices based on a cell ID of a cell. The Node B may generate a pseudo-random sequence based on the first index, generate a scrambling sequence based on the second index, and generate a reference signal sequence based on the pseudo-random sequence and the scrambling sequence. The Node B may then generate a reference signal for the cell based on the reference signal sequence, e.g., by generating an OFDM symbol with the reference signal sequence mapped to a set of subcarriers.
Description
The application requires to enjoy on August 14th, 2007 that submit, name and is called the U.S. Provisional Application No.60/955 of " METHOD ANDAPPARATUS FOR REFERENCE SIGNAL GENERATION FOR E-UTRAN ", 801 priority, this provisional application have transferred the application's assignee and have incorporated this paper into way of reference.
Technical field
Put it briefly, the present invention relates to communication, specifically, the present invention relates to be used for generating the technology of reference signal at wireless communication system.
Background technology
For the various types of Content of Communication such as speech, video, grouped data, message, broadcasting etc. are provided, widespread deployment wireless communication system.These wireless systems can be to support a plurality of users' multi-address system by sharing the available system resource.The example of this class multi-address system comprises code division multiple access (CDMA) system, time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, quadrature FDMA (OFDMA) system and Single Carrier Frequency Division Multiple Access (SC-FDMA) system.
Wireless communication system can comprise any amount of Node B, and it can support the communication of any amount of subscriber equipment (UE).Each Node B is supported one or more sub-districts and is sent the reference signal that is used for each sub-district termly.Reference signal can also be called pilot tone.Reference signal from the sub-district can be used for various purposes by UE, for example channel estimating, signal strength measurement, signal quality measured etc.Can expect to generate reference signal in some way, so that good performance is provided and simplifies Node B and the reference signal processing procedure at UE place.
Summary of the invention
The application has described the technology that is used for generating at wireless communication system reference signal.In one aspect, can generate one group of Q reference signal sequence according to G pseudo random sequence and L scramble sequence, wherein, Q=GL, G＞1 and L＞1.Each reference signal sequence can generate according to specific pseudo random sequence and specific scramble sequence.This Q reference signal sequence can be used for Q cell ID (ID), reference signal sequence of each sub-district ID.
In a kind of design, Node B can be determined first index and second index according to the sub-district ID of sub-district.Node B can generate pseudo random sequence according to first index, generates scramble sequence according to second index.Described scramble sequence can generate according to maximal-length sequence (M sequence), Golay complementary series etc.Node B can generate reference signal sequence according to described pseudo random sequence and described scramble sequence, for example, by with described pseudo random sequence and described scramble sequence one by one symbol multiply each other.Then, Node B can generate the reference signal of described sub-district according to described reference signal sequence, for example, by described reference signal sequence is mapped on one group of subcarrier, and utilizes the reference signal sequence generation OFDM symbol that is mapped to this group subcarrier.
In a kind of design, UE can determine first and second index according to the sub-district ID by this detected sub-district of UE.UE can generate pseudo random sequence according to described first index, generates scramble sequence according to described second index, generates reference signal sequence according to described pseudo random sequence and described scramble sequence.UE can handle the reference signal that receives from described sub-district according to described reference signal sequence.UE can be according to the reference signal from described sub-district, carries out channel estimating, signal strength measurement, signal quality measured, time tracking, frequency-tracking, Noise Estimation and/or other function.
Various aspects of the present invention and feature are described in further detail below.
Description of drawings
Fig. 1 shows wireless communication system.
Fig. 2 shows synchronously and the exemplary transmission of reference signal.
Fig. 3 shows a kind of design that generates reference signal sequence.
Fig. 4 A shows the reference signal transmission at the regular circulation prefix.
Fig. 4 B shows the reference signal transmission at extended cyclic prefix.
Fig. 4 C shows the reference signal transmission from two antennas.
Fig. 5 shows the block diagram of Node B and UE.
Fig. 6 shows the synchronous and reference signal generator at Node B place.
Fig. 7 shows the synchronous and reference signal generator at UE place.
Fig. 8 shows and generates synchronously and the processing procedure of reference signal.
Fig. 9 shows and is used to generate synchronously and the device of reference signal.
Figure 10 shows and is used to receive synchronously and the processing procedure of reference signal.
Figure 11 shows and is used to receive synchronously and the device of reference signal.
Embodiment
The technology that the present invention describes can be used for various wireless communication systems, for example CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other system.Term " system " and " network " can exchange use usually.Cdma system can be realized for example radiotechnics of general land wireless access (UTRA), cdma2000 etc.UTRA comprises other variant of wideband CDMA (WCDMA) and CDMA.Cdma2000 is contained IS-2000, IS-95 and IS-856 standard.Tdma system can be realized the radiotechnics such as global system for mobile communications (GSM).The OFDMA system can realize for example evolved UTRA (E-UTRA), Ultra-Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM
Deng radiotechnics.UTRA and E-UTRA are the parts of Universal Mobile Telecommunications System (UMTS).3GPP Long Term Evolution (LTE) is the UMTS version that is about to the use E-UTRA of issue, and it adopts SC-FDMA adopting OFDMA on the down link on up link.In file, UTRA, E-UTRA, UMTS, LTE and GSM have been described from " third generation partner program " tissue (3GPP) by name.In file, cdma2000 and UMB have been described from " third generation partner program 2 " tissue (3GPP2) by name.For the sake of clarity, describe some aspect of the technology of the present invention below at LTE, and used the LTE term in the description of following major part.
Fig. 1 shows wireless communication system 100, and it can be the LTE system.System 100 can comprise Node B and other network entity of any amount.For simply, only show three Node B 110a, 110b and 110c among Fig. 1.Node B can be the fixed station of communicating by letter with UE, and also can be called enode b (eNB), base station, access point etc.Each Node B 110 covers for specific geographical area 102 provides communication.In order to improve system capability, the whole overlay area of Node B can be divided into a plurality of littler zones, for example three littler regional 104a, 104b and 104c.Each littler zone can be by Node B subsystem service separately.In 3GPP, term " sub-district " refers to the smallest coverage area of Node B and/or serves the Node B subsystem of this overlay area.In other systems, term " sector " base station sub-system that refers to the smallest coverage area of base station and/or serve this overlay area.For simply, use the 3GPP notion of sub-district in the following description.
In example shown in Figure 1, each Node B 110 has three sub-districts 1,2 and 3, and it covers different geographic areas.The sub-district of Node B 110a, 110b and 110c can be moved on identical frequency or different frequency.For the sake of clarity, Fig. 1 shows mutual nonoverlapping sub-district.In actual disposition, neighbor cell is overlapped in edge usually.Cover this overlapping of edge and guaranteed that UE moves to any position and can both be in the covering of one or more sub-districts in system.
UE 120 can be dispersed in the whole system, and each UE can be that fix or mobile.UE can also be called mobile radio station, terminal, accesses terminal, subscriber unit, stand etc.UE can be cell phone, PDA(Personal Digital Assistant), radio modem, Wireless Telecom Equipment, handheld device, kneetop computer, cordless telephone etc.UE can communicate by letter with Node B with the transmission on the up link by down link.Down link (or forward link) refers to the communication link from the Node B to UE, and up link (or reverse link) refers to the communication link from UE to the Node B.In Fig. 1, there is the solid line of double-head arrow to point out communication between Node B and the UE.There is the dotted line of single arrow to point out that UE is from Node B receiving downlink signal.UE can carry out Cell searching and other function according to the down link signal that Node B sends.
In system 100, each Node B can send the master sync signal and the auxiliary synchronous signal of each sub-district that is used for this Node B termly.UE can search for master sync signal and auxiliary synchronous signal so that detected cells and obtaining such as the such information of sub-district ID, timing and the frequency shift (FS) of detected sub-district.Each Node B can also send the reference signal of each sub-district that is used for this Node B termly.UE can be used for the reference signal from detected sub-district various functions, for example channel estimating, signal strength measurement, signal quality measured etc.
Fig. 2 shows according to a kind of master sync signal that is used for a sub-district of design and the exemplary transmission of auxiliary synchronous signal and reference signal.The transmission time line of down link can be divided into the radio frames unit.Each radio frames can have predetermined time duration (for example, 10 milliseconds (ms)) and can be divided into 20 time slots, and its index is 0 to 19.Each time slot can cover symbol period fixing or configurable number, for example, is 6 symbol periods for extended cyclic prefix, is 7 symbol periods for the regular circulation prefix.
In design shown in Figure 2, each time slot comprises that index is 7 symbol periods of 0 to 6.Can be respectively in the symbol period 6 and 5 of each time slot 0 of each radio frames and time slot 10, send master sync signal and auxiliary synchronous signal.Reference signal can send in the symbol period 0 and 4 of each time slot of each radio frames.
Generally speaking, each master sync signal and auxiliary synchronous signal and reference signal can send with any speed separately, for example, send arbitrary number of times in each radio frames.Master sync signal and auxiliary synchronous signal can send in any two symbol periods of time slot.Auxiliary synchronous signal can send (for example, before or after it immediately send) near master sync signal, like this, can derive channel estimating and be used for coherent detection to auxiliary synchronous signal from master sync signal.Reference signal can be in any amount of symbol period and the optional sign of each time slot send in the cycle.Reference signal can be even as far as possible at interval in the symbol period of each time slot.
Be each cell allocation sub-district ID, this sub-district ID is unique in all sub-districts in certain scope of this sub-district.This sub-district ID distribute to allow each UE can discern detected all sub-districts of this UE uniquely, and with the location independent of this UE.System can support one group of Q sub-district ID, and Q can be an any integer value.Then, from this group sub-district ID that is supported, be the specific sub-district ID of each cell allocation.
In a kind of design, system supports one group of Q=504 unique sub-district ID.These 504 sub-district ID can be grouped in 168 unique sub-district ID groups, and each sub-district ID group comprises three unique sub-district ID.Grouping makes each sub-district ID only be included in the sub-district ID group.
In a kind of design, sub-district ID can be expressed as:
C
ID=3g+l, formula (1)
Wherein, C
ID∈ 0 ..., 503} is sub-district ID,
G ∈ 0 ..., 167} is the index of the sub-district ID group under the ID of this sub-district;
{ 0,1,2} is the index of the specific ID in this sub-district ID group to l ∈.
In the design shown in the formula (1), sub-district ID can by (i) first number or scope 0 in 167 and represent the index of this sub-district ID group and (ii) second number or scope 0 to 2 in and represent that the index of the ID of this sub-district ID in organizing defines.
Generally speaking, can support the sub-district ID (Q) of any amount, sub-district ID can be grouped into an any amount group (G), and every group can comprise an any amount sub-district ID (L).For the sake of clarity, it is at above-described design that following major part is described, wherein always total Q=504 sub-district ID, G=168 sub-district ID organize and every group in L=3 sub-district ID arranged.
Three probable values at the index l of three sub-district ID in every group can define three Primary Synchronisation Codes (PSC) sequence.In addition, 168 probable values at the index g of 168 possible sub-district ID groups can define 168 auxiliary synchronous codes (SSC) sequence.PSC and SSC sequence can followingly be represented:
D
Psc, l(n) be the PSC sequence of index l, wherein, l ∈ 0,1,2}
D
Ssc, g(n) be the SSC sequence of index g, wherein, g ∈ 0 ..., 167},
Wherein, n ∈ 0 ..., 61} is the notation index of PSC and SSC sequence.Index g is also referred to as the SSC index, and index l is also referred to as the PSC index.
Can generate the PSC sequence according to the Zadoff-Chu sequence.Can generate the SSC sequence according to one or more M sequences.PSC and SSC sequence can be as " the EvolvedUniversal Terrestrial Radio Access (E-UTRA) by name that can openly obtain; Physical Channels andModulation (Release 8) " 3GPP TS 36.211 described in generate.
In one aspect, can generate Q reference signal sequence, wherein Q=GL according to G pseudo random sequence and L scramble sequence.Each reference signal sequence can generate according to specific pseudo random sequence and specific scramble sequence.Q reference signal sequence can be used for Q sub-district ID, reference signal sequence of each sub-district ID.Each sub-district can generate reference signal according to the sub-district ID corresponding reference burst with it.
In a kind of design, pseudo random sequence, scramble sequence and reference signal sequence can be expressed as follows:
P
g(n) be the pseudo random sequence of SSC index g, wherein g ∈ 0 ..., 167}
S
l(n) be the scramble sequence of PSC index l, wherein l ∈ 0,1,2}
R
G, l(n) be the reference signal sequence of PSC index l and SSC index g,
Wherein, n ∈ 0 ..., N-1} is-symbol index.N can equal 220 or some other values.
In above-mentioned design, the index g of sub-district ID group is used for the index g of pseudo random sequence.Therefore, pseudo random sequence is linked to the SSC sequence.The index l of ID in the sub-district ID group is used for the index l of scramble sequence.Therefore, scramble sequence is linked to the PSC sequence.Each sub-district ID is mapped to a specific PSC sequence d
Psc, l(n), specific SSC sequence d
Ssc, g(n), specific pseudo random sequence p
g(n), specific scramble sequence s
l(n) and a specific reference signal sequence r
G, l(n).
Can generate pseudo random sequence in various manners.In a kind of design, can generate G pseudo random sequence according to the M sequence.In the another kind design, can generate pseudo random sequence according to Gold sequence c (n), c (n) can be expressed as:
C (n)=[x
1(n)+x
2(n)] mod 2 formula (2)
Wherein, x
1(n+31)=[x
1(n+3)+x
1(n)] mod 2,
x
2(n+31)=[x
2(n+3)+x
2(n+2)+x
2(n+1)+x
2(n)] mod 2, and
" mod " represents modular arithmetic.
In formula (2), x
1(n) be a M sequence that generates according to first generator polynomial, x
2(n) be the 2nd M sequence that generates according to second generator polynomial.Each M sequence can utilize linear feedback shift register (LFSR) to generate, and wherein this LFSR realizes the generator polynomial of this M sequence.Each LFSR can be initialized to suitable initial value.The first and second M sequences and Gold sequence length are 2
31-1.Gold sequence c (n)) has value 0 or 1 for each n value.
Can followingly generate this G pseudo random sequence according to the Gold sequence:
In formula (3), pseudo random sequence p
g(n) be made up of the complex value symbol, each complex value symbol is by two continuous symbol definition of Gold sequence.The Gold sequence is according to initial value c
InitGenerate, this initial value can be determined according to SSC index g.Different pseudo random sequences can generate with the different initial values of Gold sequence.Initial value c
InitCan be used for initialization the one M sequence x
1(n) LFSR and/or the 2nd M sequence x
2(n) LFSR.
In a kind of design, identical pseudo random sequence can be used at each symbol period that sends reference signal therein in the sub-district.In this design, initial value c
InitCan be the function of SSC index g, perhaps c
Init=f (g), wherein, f () can be any suitable function.In the another kind design, different pseudo random sequences is used at the distinct symbols cycle of each time slot or each subframe of two time slots in the sub-district.In this design, initial value c
InitCan be the function of SSC index g and symbol period index t, perhaps c
Init=f (g, t).In the another kind design, different pseudo random sequences can be used at different time slots or subframe in the sub-district.In this design, initial value c
InitCan be the function of SSC index g and time slot or subframe index s, perhaps c
Init=f (g, s).In the another kind design, different pseudo random sequences can be used at the distinct symbols cycle in different time-gap or the subframe in the sub-district.In this design, initial value c
InitCan be the function of SSC index g and symbol period index t and time slot or subframe index s, perhaps c
Init=f (g, t, s).Generally speaking, pseudo random sequence (i) can be static and all symbol periods that be used for sending therein reference signal, or (ii) can wait and change at different symbol periods, different time-gap, different subframe.
Can generate L scramble sequence in various manners.In a kind of design, can generate scramble sequence according to L M sequence, each scramble sequence generates according to different M sequences.In the another kind design, can generate scramble sequence according to the different cyclic shifts of single M sequence.In the another kind design, can generate scramble sequence according to the Golay complementary series.Marcel J.E.Golay is " Complementary Series " IRE Trans.Inform.Theory at exercise question, IT-7:82-87 has described the right a kind of direct building method of different Golay complementary seriess that is used to generate any length N in 1961 the paper.Can also be by being a pair of Golay complementary series of N and the Hadamard matrix multiple of N * N with length, the different N that obtains length and be N is to the Golay complementary series.Can also otherwise generate scramble sequence, for example, with the sequence of other type with good correlation.
In a kind of design, scramble sequence has identical length N with pseudo random sequence.In another kind design, can to come extension length be the short scramble sequence of S by repeating needed number of times, be the scramble sequence of N so that obtain length.Can following expansion short scramble sequence:
s
l(n+iS)=s '
l(n), i=0 wherein, 1 ..., formula (4)
Wherein, s '
l(n) be short scramble sequence at PSC index l.
In a kind of design, can followingly generate reference signal sequence according to pseudo random sequence and scramble sequence:
r
G, l(n)=p
g(n) s
l(n), wherein l ∈ 0,1,2} and g ∈ 0 ..., 167} formula (5)
LTE utilizes OFDM (OFDM) on down link.OFDM is divided into a plurality of (K) orthogonal sub-carriers with system bandwidth, and they generally are also referred to as tone, frequency range etc.Distance between the adjacent sub-carrier is fixed, and total number of subcarriers (K) depends on system bandwidth.Each subcarrier can be modulated with data.
In order to generate the OFDM symbol, can be with real number and/or complex values sign map to the subcarrier that is used to transmit, and 0 sign map that will have 0 signal value is to the subcarrier that is not used in transmission.With K point quick Fourier inverse transformation (IFFT) symbol of K altogether of K subcarrier is altogether carried out conversion, so that obtain to comprise the useful part of K time-domain sampling.Duplicate last C the front of sampling and appending to this useful part of this useful part, form the OFDM symbol that comprises K+C sampling.The part of being duplicated is called Cyclic Prefix, and is used to tackle the intersymbol interference (ISI) owing to frequency selective fading causes.LTE supports to have the regular circulation prefix of conventional value C and has the extended cyclic prefix of bigger value C.At the regular circulation prefix, time slot can comprise 7 symbol periods, and perhaps at extended cyclic prefix, time slot can comprise 6 symbol periods.
Fig. 3 shows the design of the reference signal that is used to generate the sub-district.Can be with pseudo random sequence p
g(n) with scramble sequence s
l(n) symbol multiplies each other one by one, to generate reference signal sequence r
G, l(n), as shown in formula (5).It is k that the N of a reference signal sequence symbol can be mapped to the index that is used to send this reference signal
0To k
N-1One group of N subcarrier on.A subcarrier space predetermined quantity subcarrier that is used for reference signal, for example 6 subcarriers.The subcarrier that is not used for reference signal can be used to send data and/or out of Memory.
Fig. 4 A shows and utilizes the design of regular circulation prefix from an antenna transmission reference signal of a sub-district.In this design, each time slot comprises 7 symbol periods 0 to 6, and each reference signal sends in the symbol period 0 to 4 of each time slot.Reference signal sends on first group of subcarrier in symbol period 0,6 subcarriers of this group subcarrier spacing.Reference signal sends on second group of subcarrier in symbol period 4, and this group subcarrier is 6 subcarriers in interval also.3 subcarriers of sub-carrier offset in subcarrier in second group and first group.
Fig. 4 B shows and utilizes the design of extended cyclic prefix from an antenna transmission reference signal of a sub-district.In this design, each time slot comprises 6 symbol periods 0 to 5, and reference signal sends in the symbol period 0 and 3 of each time slot.Reference signal is sending on second group of subcarrier on first group of subcarrier and in symbol period 3 in symbol period 0.
Fig. 4 C shows and utilizes the design of regular circulation prefix from two antenna transmission reference signals of a sub-district.In this design, at antenna 0, reference signal is sending on second group of subcarrier on first group of subcarrier and in the symbol period 4 at each time slot in the symbol period 0 of each time slot.At antenna 1, reference signal is sending on first group of subcarrier on second group of subcarrier and in the symbol period 4 at each time slot in the symbol period 0 of each time slot.The subcarrier that is used for transmission of reference signals by an antenna can not be used for transmission by other antenna.
Generally speaking, reference signal can be from an any amount antenna transmission.Reference signal can be in a symbol period on one group of subcarrier from an antenna transmission, and do not have signal on this group subcarrier from other antenna transmission, so that avoid interference to reference signal.
Fig. 5 shows the block diagram of the design of Node B 110 and UE 120, and they are one of Node B and one of UE among Fig. 1.In this design, Node B 110 is equipped with T antenna 534a to 534t, and UE 120 is equipped with R antenna 552a to 552r, general T 〉=1 and R 〉=1.
At Node B 110 places, emission processor 520 can receive the data of one or more UE from data source 512, according to the data of handling this UE for the modulation and the encoding scheme of each UE selection, and provides the data symbol of all UE.Emission processor 520 can also generate master sync signal and the auxiliary synchronous signal and the reference signal of each sub-district, and the symbol of master sync signal and auxiliary synchronous signal and reference signal is provided at all sub-districts in the Node B 110.Emission (TX) multiple-input and multiple-output (MIMO) processor 530 can the multiplex data symbol, frequency pilot sign and synchronously and the symbol of reference signal.If be suitable for, TX MIMO processor 530 can be carried out spatial manipulation (for example, precoding) to the multiplexing symbol of process, and provides T output symbol stream to T modulator (MOD) 532a to 532t.Each modulator 532 can be handled output symbol stream (for example, at OFDM) separately so that obtain the output sample streams.Each modulator 532 can further be handled output sample streams (for example, being converted to simulation, amplification, filtering and up-conversion) to obtain down link signal.Can send T the down link signal of automodulation device 532a respectively to 534t by T antenna 534a to 532t.
At UE 120 places, antenna 552a can offer demodulator (DEMOD) 554a respectively to 554r from Node B 110 receiving downlink signals and with the signal that receives to 552r.Each demodulator 554 can be adjusted (for example, filtering, amplification, down-conversion and digitlization) received signal separately so that obtain input sample and further handle input sample (for example, at OFDM), to obtain receiving symbol.MIMO detector 556 can obtain the receiving symbol to 554r from all R demodulator 554a, if available then receiving symbol is carried out MIMO detect, and detected symbol would be provided.Receiving processor 558 can be handled (for example, demodulation, deinterleaving and decoding) detected symbol and the decoded data of UE 120 is provided to data sink 560.Generally speaking, the TX MIMO processor 530 at performed processing procedure of MIMO detector 556 and receiving processor 558 and Node B 110 places and emission processor 520 performed processing procedures are complementary.
On up link, at UE 120 places, from the data of data source 562 with come the signaling of self-controller/processor 580 to handle, if suitable then further handle by TXMIMO processor 566 by emission processor 564, adjust to 554r by modulator 554a, and be sent to Node B 110.At Node B 110 places, if can receive by antenna 534, adjust suitable by demodulator 532 then handle from the uplink signal of UE 120, and further handle data and the signalings that send by UE 120 to obtain by receiving processor 538 by MIMO detector 536.
Controller/processor 540 and 580 can instruct the operation at Node B 110 and UE 120 places respectively.Memory 542 and 582 can be stored data and the program code that is used for Node B 110 and UE 120 respectively.Scheduler 544 can be dispatched UE and provide resource allocation for the UE of scheduling at down link and/or ul transmissions.Synchronous and the reference signal processor 570 at UE 120 places can be carried out the processing at master sync signal and auxiliary synchronous signal and reference signal.
Fig. 6 shows the design frame chart of the synchronous and reference signal generator 600 of Node B 110.Maker 600 can be the emission processor 520 among Fig. 5 and/or the part of modulator 532.Maker 600 can receive the sub-district ID of cell x, and generates master sync signal and the auxiliary synchronous signal and the reference signal of cell x.
In maker 600, index mapper 610 can receive the sub-district ID of cell x and PSC index l and the SSC index g corresponding with this sub-district ID is provided, for example, and as shown in formula (1).Maker 622 can generate the PSC sequence of cell x according to PSC index l.Maker 624 can generate the master sync signal of cell x according to this PSC sequence, for example, and by the sign map of PSC sequence is carried out the OFDM modulation to the subcarrier that is used for master sync signal and to mapping symbols.
Fig. 7 shows the design frame chart of the synchronous and reference signal processor 570 at UE 120 places in Fig. 5.In this design, processor 570 comprises sample buffer 710, the synchronous signal processor of being made up of square frame 722,724 and 726 and the reference signal processor of being made up of square frame 732 to 744.Sample buffer 710 can receive and store input sample, and suitable input sample is provided requested the time.
Synchronous signal processor can detect master sync signal and auxiliary synchronous signal so that search cell.In synchronous signal processor, detector 722 can detect master sync signal in each timing hypothesis (for example, each sampling period).Detector 722 can be relevant with different possible PSC sequences with input sample, so that obtain the correlated results of each timing hypothesis.Then, detector 722 can determine whether to detect master sync signal according to this correlated results.If detect master sync signal, then detector 722 can provide detected PSC sequence, symbol regularly and the information (for example, PSC index l) that sends in this master sync signal.
When detecting master sync signal, detector 724 can detect auxiliary synchronous signal.Detector 724 can remove frequency shift (FS) from input sample, with the revised sample conversion of frequency to frequency domain, and use the channel gain of deriving to come frequency domain symbol is carried out coherent detection, to obtain incoming symbol from detected master sync signal.Then, detector 724 can be relevant with the acquisition correlated results with different possible SSC sequences with incoming symbol, and determine whether to detect auxiliary synchronous signal according to this correlated results.If detect auxiliary synchronous signal, then detector 724 can provide detected SSC sequence, frame regularly and the information (for example, SSC index g) that sends in auxiliary synchronous signal.Look-up table 726 can receive detected PSC index l and SSC index g, and the sub-district ID of detected sub-district is provided.
Reference signal processor can be handled the reference signal from each detected sub-district.In reference signal processor, maker 732 can generate the scramble sequence of this sub-district according to the PSC index l of detected sub-district.Maker 734 can generate the pseudo random sequence of this sub-district according to the SSC index g of detected sub-district.Maker 736 can generate the reference signal sequence of detected sub-district according to this pseudo random sequence and scramble sequence.Detector 738 can from input sample, remove frequency shift (FS) and with the revised sample conversion of frequency to frequency domain, to obtain receiving symbol.Detector 738 can multiply each other the symbol of this receiving symbol and reference signal sequence, to obtain and the corresponding detected symbol of all subcarriers that is used to send reference signal.
Signal strength measurement unit 742 can be measured the signal strength signal intensity of detected sub-district according to detected symbol, for example the power by the detected symbol that adds up.Signal strength measurement can be used to communication to select proper cell, make and switch decision or the like.Signal quality measured unit 744 can be measured the received signal quality of detected sub-district according to detected symbol, for example by with the power of detected symbol divided by interference and the noise power estimated.Unit 744 can also be derived CQI (CQI) information of detected sub-district according to received signal quality.This CQI information can be sent to Node B, Node B can be according to this CQI Information Selection suitable modulation and encoding scheme, to be used for the transfer of data to UE 120.Though do not illustrate in Fig. 7, the detected symbol of reference signal can also be used for other purpose, for example Noise Estimation, time tracking, frequency-tracking etc.
Reference signal processor can be handled the reference signal from each interested detected sub-district.As long as receive reference signal from each detected sub-district, reference signal processor just can be handled the reference signal from this sub-district termly.
Fig. 8 shows and is used for generating synchronously and the design of the processing procedure 800 of reference signal at wireless communication system.Processing procedure 800 can be carried out by the Node B (as described below) of sub-district or by a certain other entity.
Node B can be determined first index and second index (square frame 812) according to the sub-district ID of sub-district.First index can be SSC index g, and second index can be PSC index l.Node B can generate PSC sequence (square frame 814) according to second index, and can generate SSC sequence (square frame 816) according to first index.Node B can generate the master sync signal (square frame 818) of this sub-district according to the PSC sequence, and can generate the auxiliary synchronous signal (square frame 820) of this sub-district according to the SSC sequence.
Node B can generate pseudo random sequence (square frame 822) according to first index.This pseudo random sequence can be one of G possible pseudo random sequence corresponding with G probable value of first index.This pseudo random sequence can be fixed, and perhaps can change on symbol period, time slot, subframe etc.Node B can generate scramble sequence (square frame 824) according to this second index.Can have mapping one by one between PSC sequence and the scramble sequence, they can get up by second indexed links.Scramble sequence can be one of L possible scramble sequence corresponding with L probable value of second index.Scramble sequence can generate according to M sequence, Golay complementary series etc.Scramble sequence can have the length identical with pseudo random sequence.As an alternative, can repeat short scramble sequence to obtain to have the scramble sequence with the pseudo random sequence equal length, for example, as shown in formula (4).Identical pseudo random sequence can be used for regular circulation prefix and extended cyclic prefix with identical scramble sequence.
Node B can generate reference signal sequence according to pseudo random sequence and scramble sequence, for example, by with pseudo random sequence and scramble sequence one by one symbol multiply each other, as shown in formula (5) (square frame 826).Then, Node B can generate the reference signal (square frame 828) of this sub-district according to this reference signal sequence.For square frame 828, Node B can be mapped to reference signal sequence the one group of subcarrier that is used for reference signal.Then, Node B can generate the OFDM symbol with the reference signal sequence that is mapped to this group subcarrier.This OFDM symbol will comprise reference signal.Node B can send reference signal (for example, as shown in Fig. 4 A, 4B or 4C) termly, so that be used for channel estimating, signal strength measurement, signal quality measured, time tracking, frequency-tracking, Noise Estimation etc. by UE.
Fig. 9 shows and is used for generating synchronously and the design of the device 900 of reference signal at wireless communication system.Device 900 comprises: module 912 is used for determining first index and second index according to the sub-district ID of sub-district; Module 914 is used for generating the PSC sequence according to second index; Module 916 is used for generating the SSC sequence according to first index; Module 918 is used for generating according to the PSC sequence master sync signal of this sub-district; Module 920 is used for generating according to the SSC sequence auxiliary synchronous signal of this sub-district; Module 922 is used for generating pseudo random sequence according to first index; Module 924 is used for generating scramble sequence according to second index; Module 926 is used for generating reference signal sequence according to pseudo random sequence and scramble sequence; And module 928, be used for generating the reference signal of this sub-district according to this reference signal sequence.
Figure 10 shows and is used for receiving synchronously and the design of the processing procedure 1000 of reference signal at wireless communication system.Processing procedure 1000 can be carried out by UE (as described below) or by some other entities.UE can detect the PSC sequence (square frame 1012) from the sub-district, and can detect the SSC sequence (square frame 1014) from this sub-district.UE can determine first index (for example, SSC index g) (square frame 1016) of the sub-district ID of this sub-district according to detected SSC sequence, and can determine second index (for example, PSC index l) (square frame 1018) of this sub-district ID according to detected PSC sequence.
UE can generate pseudo random sequence (square frame 1020) according to first index, and can generate scramble sequence (square frame 1022) according to second index.UE can generate reference signal sequence (square frame 1024) according to pseudo random sequence and scramble sequence.UE can handle the reference signal (square frame 1026) that receives from this sub-district according to this reference signal sequence.UE can derive channel estimating, measure signal intensity, measures signal quality, time of implementation tracking according to the reference signal from this sub-district, carry out frequency-tracking and/or carry out other function.
Figure 11 shows and is used for receiving synchronously and the design of the device 1100 of reference signal at wireless communication system.Device 1100 comprises: module 1112 is used to detect the PSC sequence from the sub-district; Module 1114 is used to detect the SSC sequence from this sub-district; Module 1116 is used for determining according to detected SSC sequence first index of the sub-district ID of this sub-district; Module 1118 is used for determining according to detected PSC sequence second index of this sub-district ID; Module 1120 is used for generating pseudo random sequence according to first index; Module 1122 is used for generating scramble sequence according to second index; Module 1124 is used for generating reference signal sequence according to pseudo random sequence and scramble sequence; And module 1126, be used for handling the reference signal that receives from this sub-district according to this reference signal sequence.
Processing procedure among Fig. 8 to 11 can impliedly or clearly be carried out.For example, because the sub-district ID of sub-district can fix, so can calculate the reference signal sequence of this sub-district in advance and be stored in the memory.Processing procedure in the square frame 822,824 and 826 among Fig. 8 and/or the processing procedure in the square frame among Figure 10 1020,1022 and 1024 can impliedly be carried out by the reference signal sequence that obtains this sub-district from memory.
Module among Fig. 9 and 11 can comprise processor, electronic equipment, hardware device, electronic building brick, logical circuit, memory etc., or their combination in any.
In the design of replacing,, can generate reference signal sequence with different modes at regular circulation prefix and extended cyclic prefix.At the regular circulation prefix, can be that 3 orthogonal sequence generates 504 reference signal sequences according to 168 length pseudo random sequence that is N and 3 length.Can repeat each orthogonal sequence to obtain the expansion orthogonal sequence that length is N.At extended cyclic prefix, the pseudo random sequence that is N according to 504 length can generate 504 reference signal sequences.
As mentioned above, the reference signal sequence according to pseudo random sequence and scramble sequence generation can provide the replacement design more unexistent advantages.At first, scramble sequence can provide improved performance for reference signal sequence than orthogonal sequence.Orthogonal sequence can make the channel estimating performance of the wireless channel with big delay expansion reduce, and scramble sequence then can be avoided this problem.The second, 168 pseudo random sequences on the same group can be used for regular circulation prefix and extended cyclic prefix mutually.This can simplify the realization of UE, because (i) need not generate different pseudo random sequences with extended cyclic prefix at the regular circulation prefix, (ii) all uses the single-receiver structure to be used for channel estimating at regular circulation prefix and extended cyclic prefix.Because (i) mapping one by one between L the probable value of L scramble sequence and PSC index, and the (ii) mapping one by one between G the probable value of G pseudo random sequence and SSC index, sub-district ID also can be used for pseudo random sequence and scramble sequence to the mapping of PSC and SSC index.
It will be appreciated by those skilled in the art that information and signal can use any multiple different technology and method to represent.For example, data, instruction, order, information, signal, bit, symbol and the chip of mentioning in the description on run through can be represented with voltage, electric current, electromagnetic wave, magnetic field or particle, light field or particle or its combination in any.
Those skilled in the art be to be further appreciated that various illustrative logical blocks, module, circuit and the algorithm steps described in conjunction with the disclosure all can be embodied as electronic hardware, computer software or both combinations.For the interchangeability between the hardware and software clearly is described, above various exemplary assemblies, square frame, module, circuit and step have all been carried out describe, in general terms around its function.Be embodied as hardware or be embodied as software as for this function, depend on specific application and design constraint that whole system applied.Those skilled in the art can be at each application-specific, realizes described function in the mode of accommodation, and still, this realization decision-making should not be construed as and deviates from protection scope of the present invention.
Various exemplary box, module and the circuit of describing in conjunction with the disclosure can be implemented in general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components or is designed in any combination of the assembly of carrying out function described herein, or carried out by them.General processor can be a microprocessor, and perhaps, processor also can be processor, controller, microcontroller or the state machine of any routine.Processor also can be implemented as the combination of computing equipment, for example, and the combination of DSP and microprocessor, a plurality of microprocessor, one or more microprocessor that combines with the DSP kernel, perhaps any other this kind structure.
In the software module that can be embodied directly in the hardware, carry out by processor in conjunction with the step of described method of the disclosure and algorithm or in the combination of the two.Software module can be positioned at the storage medium of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, portable hard drive, CD-ROM or any other form known in the art.Exemplary storage medium can be coupled with processor, and this processor can read information from storage medium, and to the storage medium writing information.As an alternative, storage medium can be integrated in the processor.Processor and storage medium may reside among the ASIC.ASIC may reside in the user terminal.As an alternative, processor and storage medium also can be used as discrete assembly and are present in the user terminal.
In one or more exemplary designs, described function can with hardware, software, firmware or it be arbitrarily in conjunction with realizing.If realize in software, these functions can be used as one or more instructions or code storage on computer-readable medium or transmit.Computer-readable medium comprises computer-readable storage medium and transmission medium, and transmission medium comprises any medium of being convenient to computer program is transferred to from a place another place.Storage medium can be any usable medium of universal or special computer-accessible.For example, but be not to make restriction, this type of computer-readable medium can comprise RAM, ROM, EEPROM, CD-ROM or other optical disc memory apparatus, disk storage device or other magnetic storage apparatus, and maybe can be used for carrying or store the code modules of needs with the instruction or the form of data structure also can be by any other medium of universal or special computer or universal or special processor access.In addition, any connection also all can suitably be known as computer-readable medium.For example, if software by coaxial cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line or wireless technology (for example infrared, radio and microwave) from the website, server or other remote source send, coaxial cable, fiber optic cables, twisted-pair feeder, DSL or wireless technology (for example infrared, radio and microwave) then are included in the definition of medium so.Used disk and CD among the present invention comprises compact disc (CD), laser disk, CD, digital versatile disc (DVD), floppy disc and Blu-ray Disc, and wherein, the common electromagnetic ground of disk reproduces data, and CD then reproduces data optically with laser.Above-mentioned combination also should be included in the scope of computer-readable medium.
For making those skilled in the art realize or to use the present invention, provide above description the of the present disclosure.To those skilled in the art, all be conspicuous for various modifications of the present disclosure, and the defined general principles of the present invention also can be applicable to other variant on the basis that does not break away from protection scope of the present invention.Therefore, the present invention is not limited to example and the design that the present invention describes, but consistent with the widest scope of principle disclosed by the invention and novel features.
Claims (32)
1. method that generates reference signal in wireless communication system comprises:
Cell ID (ID) according to the sub-district generates pseudo random sequence;
Generate scramble sequence according to described sub-district ID;
Generate reference signal sequence according to described pseudo random sequence and described scramble sequence;
Generate the reference signal of described sub-district according to described reference signal sequence.
2. the method for claim 1 also comprises:
Determine first index and second index according to described sub-district ID, wherein, the step that generates described pseudo random sequence comprises according to described first index and generates described pseudo random sequence, and wherein, and the step that generates described scramble sequence comprises according to described second index and generates described scramble sequence.
3. method as claimed in claim 2, wherein, the step that generates described pseudo random sequence according to described first index comprises that the described pseudo random sequence of generation is as one of the G corresponding with G probable value of described first index possible pseudo random sequence, wherein G is the integer greater than 1, and wherein, the step that generates described scramble sequence according to described second index comprises the described scramble sequence of generation as one of the L corresponding with L probable value of described second index possible scramble sequence, and wherein L is the integer greater than 1.
4. method as claimed in claim 2 also comprises:
Generate Primary Synchronisation Code (PSC) sequence according to described second index;
Generate auxiliary synchronous code (SSC) sequence according to described first index;
Generate the master sync signal of described sub-district according to described PSC sequence;
Generate the auxiliary synchronous signal of described sub-district according to described SSC sequence.
5. method as claimed in claim 4 wherein, is mapped to described scramble sequence according to described second index with described PSC sequence one by one.
6. the step that the method for claim 1, wherein generates described scramble sequence comprises: generate described scramble sequence according to maximal-length sequence (M sequence) or Golay complementary series.
7. the method for claim 1, wherein described scramble sequence has identical length with described pseudo random sequence.
8. the step that the method for claim 1, wherein generates described scramble sequence comprises:
Generation has first sequence of the length shorter than described pseudo random sequence;
Repeat described first sequence, to obtain to have the described scramble sequence of the length identical with described pseudo random sequence.
9. the step that the method for claim 1, wherein generates described reference signal sequence comprises: with described pseudo random sequence and described scramble sequence one by one symbol multiply each other, to obtain described reference signal sequence.
10. the step that the method for claim 1, wherein generates described reference signal comprises: at each symbol period that sends described reference signal therein,
Described reference signal sequence is mapped to the one group of subcarrier that is used for described reference signal;
The described reference signal sequence that utilization is mapped to this group subcarrier generates OFDM (OFDM) symbol, and described OFDM symbol comprises described reference signal.
11. the method for claim 1 also comprises:
Send described reference signal termly, so that be used for channel estimating, signal strength measurement, signal quality measured, time tracking, frequency-tracking, Noise Estimation or its combination in any by subscriber equipment (UE).
12. the method for claim 1, wherein described pseudo random sequence and described scramble sequence be used for regular circulation prefix and extended cyclic prefix the two.
13. a device that is used for radio communication comprises:
At least one processor, the cell ID (ID) that is used for according to the sub-district generates pseudo random sequence; Generate scramble sequence according to described sub-district ID; Generate reference signal sequence according to described pseudo random sequence and described scramble sequence; Generate the reference signal of described sub-district according to described reference signal sequence.
14. device as claimed in claim 13, wherein, described at least one processor also is used for: determine first index and second index according to described sub-district ID; Generate described pseudo random sequence according to described first index; Generate described scramble sequence according to described second index.
15. device as claimed in claim 14, wherein, described at least one processor is used for: generate Primary Synchronisation Code (PSC) sequence according to described second index; Generate auxiliary synchronous code (SSC) sequence according to described first index; Generate the master sync signal of described sub-district according to described PSC sequence; Generate the auxiliary synchronous signal of described sub-district according to described SSC sequence.
16. device as claimed in claim 13, wherein, described at least one processor is used for: generate described scramble sequence according to maximal-length sequence (M sequence) or Golay complementary series.
17. a device that is used for radio communication comprises:
The module that is used for cell ID (ID) generation pseudo random sequence according to the sub-district;
Be used for generating the module of scramble sequence according to described sub-district ID;
Be used for module according to described pseudo random sequence and described scramble sequence generation reference signal sequence;
Be used for generating the module of the reference signal of described sub-district according to described reference signal sequence.
18. device as claimed in claim 17 also comprises:
Be used for determining the module of first index and second index according to described sub-district ID, wherein, the described module that is used to generate described pseudo random sequence comprises the module that is used for generating according to described first index described pseudo random sequence, and wherein, the described module that is used to generate described scramble sequence comprises the module that is used for generating according to described second index described scramble sequence.
19. device as claimed in claim 18 also comprises:
Be used for generating the module of Primary Synchronisation Code (PSC) sequence according to described second index;
Be used for generating the module of auxiliary synchronous code (SSC) sequence according to described first index;
Be used for generating the module of the master sync signal of described sub-district according to described PSC sequence;
Be used for generating the module of the auxiliary synchronous signal of described sub-district according to described SSC sequence.
20. device as claimed in claim 17, wherein, the described module that is used to generate described scramble sequence comprises: the module that is used for generating according to maximal-length sequence (M sequence) or Golay complementary series described scramble sequence.
21. a computer program comprises:
Computer-readable medium comprises:
Be used to make at least one computer to generate the code of pseudo random sequence according to the cell ID (ID) of sub-district;
Be used to make described at least one computer to generate the code of scramble sequence according to described sub-district ID;
Be used to make described at least one computer to generate the code of reference signal sequence according to described pseudo random sequence and described scramble sequence;
Be used to make described at least one computer to generate the code of the reference signal of described sub-district according to described reference signal sequence.
22. a method that receives reference signal in wireless communication system comprises:
Cell ID (ID) according to the sub-district generates pseudo random sequence;
Generate scramble sequence according to described sub-district ID;
Generate reference signal sequence according to described pseudo random sequence and described scramble sequence;
Handle the reference signal that receives from described sub-district according to described reference signal sequence.
23. method as claimed in claim 22, wherein, the step that generates described pseudo random sequence comprises that first index according to described sub-district ID generates described pseudo random sequence, and wherein, the step that generates described scramble sequence comprises that second index according to described sub-district ID generates described scramble sequence.
24. method as claimed in claim 23 also comprises:
Detection is from Primary Synchronisation Code (PSC) sequence of described sub-district;
Determine described second index according to detected PSC sequence;
Detection is from auxiliary synchronous code (SSC) sequence of described sub-district;
Determine described first index according to detected SSC sequence.
25. method as claimed in claim 22, wherein, the step of handling described reference signal comprises: the symbol that comprises described reference signal that will receive and the symbol of described reference signal sequence multiply each other, to obtain detected symbol.
26. method as claimed in claim 22 also comprises:
According to the channel estimating of described reference signal derivation at described sub-district.
27. method as claimed in claim 22 also comprises:
Carry out in signal strength measurement, signal quality measured, time tracking, frequency-tracking and the Noise Estimation at least one according to described reference signal.
28. a device that is used for radio communication comprises:
At least one processor, the cell ID (ID) that is used for according to the sub-district generates pseudo random sequence; Generate scramble sequence according to described sub-district ID; Generate reference signal sequence according to described pseudo random sequence and described scramble sequence; Handle the reference signal that receives from described sub-district according to described reference signal sequence.
29. device as claimed in claim 28, wherein, described at least one processor is used for: first index according to described sub-district ID generates described pseudo random sequence; Second index according to described sub-district ID generates described scramble sequence.
30. device as claimed in claim 29, wherein, described at least one processor is used for: detect Primary Synchronisation Code (PSC) sequence from described sub-district; Determine described second index according to detected PSC sequence; Detection is from auxiliary synchronous code (SSC) sequence of described sub-district; Determine described first index according to detected SSC sequence.
31. device as claimed in claim 28, wherein, described at least one processor is used for: according to the channel estimating of described reference signal derivation at described sub-district.
32. device as claimed in claim 28, wherein, described at least one processor is used for: carry out at least one of signal strength measurement, signal quality measured, time tracking, frequency-tracking and Noise Estimation according to described reference signal.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95580107P | 2007-08-14 | 2007-08-14 | |
| US60/955,801 | 2007-08-14 | ||
| US12/190,889 US8289946B2 (en) | 2007-08-14 | 2008-08-13 | Reference signal generation in a wireless communication system |
| US12/190,889 | 2008-08-13 | ||
| PCT/US2008/073206 WO2009023792A1 (en) | 2007-08-14 | 2008-08-14 | Reference signal generation in a wireless communication system |
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| CN101779400A true CN101779400A (en) | 2010-07-14 |
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| CN (1) | CN101779400A (en) |
| AU (1) | AU2008286783B2 (en) |
| BR (1) | BRPI0815328A2 (en) |
| CA (1) | CA2694203A1 (en) |
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| TW (1) | TW200924415A (en) |
| WO (1) | WO2009023792A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2009023792A1 (en) | 2009-02-19 |
| US20090135803A1 (en) | 2009-05-28 |
| US8289946B2 (en) | 2012-10-16 |
| AU2008286783B2 (en) | 2012-01-19 |
| CA2694203A1 (en) | 2009-02-19 |
| RU2010109420A (en) | 2011-09-20 |
| KR20100042657A (en) | 2010-04-26 |
| MY168726A (en) | 2018-11-29 |
| MX2010001737A (en) | 2010-03-15 |
| JP2010537509A (en) | 2010-12-02 |
| BRPI0815328A2 (en) | 2015-02-10 |
| AU2008286783A1 (en) | 2009-02-19 |
| EP2179526A1 (en) | 2010-04-28 |
| TW200924415A (en) | 2009-06-01 |
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